2D Artwork: Guitar Hero Faceplate Sketch 1

This is a concept I'm playing around with; quick sketch with sharpie and Prismacolor markers. All the large solid black areas are obviously where holes are. Not too sure what I want to do with the background; probably spacescape, flames, or something funky with paint splatters. I'm planning on doing a couple more concepts and I'd love to hear what people think of each of them. When I get one I like I'm going to do my actual Guitar Hero faceplate up like it.